Remove unused __syscall_rename implementations. NFC (#18984)

This syscall was removed in #15411

Author: sbc100

src/library_syscall.js

@@ -175,13 +175,6 @@ var SyscallsLibrary = {
     FS.chmod(path, mode);
     return 0;
   },
-  __syscall_rename__sig: 'ipp',
-  __syscall_rename: function(old_path, new_path) {
-    old_path = SYSCALLS.getStr(old_path);
-    new_path = SYSCALLS.getStr(new_path);
-    FS.rename(old_path, new_path);
-    return 0;
-  },
   __syscall_rmdir__sig: 'ip',
   __syscall_rmdir: function(path) {
     path = SYSCALLS.getStr(path);

system/lib/wasmfs/syscalls.cpp

@@ -1038,10 +1038,6 @@ int __syscall_renameat(int olddirfd,
   return 0;
 }
 
-int __syscall_rename(intptr_t oldpath, intptr_t newpath) {
-  return __syscall_renameat(AT_FDCWD, oldpath, AT_FDCWD, newpath);
-}
-
 // TODO: Test this with non-AT_FDCWD values.
 int __syscall_symlinkat(intptr_t target, int newdirfd, intptr_t linkpath) {
   auto parsed = path::parseParent((char*)linkpath, newdirfd);